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Keywords:

  • cyclopolymerization;
  • halide exchange;
  • ring-opening metathesis polymerization;
  • ruthenium;
  • 1, 6-heptadiynes

Abstract

The reactivity of the dicationic Ru–alkylidene complex [Ru(DMF)3(IMesH2)(—CH—2—(2—PrO)—C6H4)]2+(BF4)2] (1, IMesH2 = 1,3-dimesitylimidazolin-2-ylidene) in the ring-opening metathesis polymerization (ROMP) of various functional norborn-2-enes as well as in the cyclopolymerization of different 1,6-heptadiynes is reported. Due to its dicationic character, complex 1 is highly electrophilic and possesses high reactivity towards alkenes and 1,6-heptadiynes. Generally, a pronounced difference in reactivity between monomers bearing coordinating groups and those that lack such moieties is observed. In the presence of ionic monomers containing coordinating anions such as Br and I, a rapid change in the nature of the propagating alkylidene from a dicationic to a neutral one is observed.